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Steam Fire Lines. Every dry cleaning building in which a flammable solvent having a flashpoint below 140 degrees Fahrenheit (closed cup tester) is used shall be provided with a high pressure steam boiler having a capacity of one horsepower for each 100 cubic feet contained in the largest dry cleaning room in the building. Such boiler shall be arranged and equipped to permit a steam pressure of not less than 30 pounds per square inch being maintained at all times during which dry cleaning operations are carried on in the building. Each dry cleaning room in the building shall be connected to such boiler by a steam pipe of not less than one and one-half inch diameter, either by a direct line to each room, or by a main or mains with branches. Where any such main or branch line passes through a wall, it shall be equipped with a tight-fitting journal solidly built into the wall construction. Discharge pipes shall be provided near the ceiling in each drying room, at intervals of not more than ten feet over the entire ceiling area, and in addition there shall be provided one discharge pipe near the ceiling over each washer and each extractor located or provided for in the room. Each such discharge pipe shall be at least two inches long and shall be directed downward. The discharge of steam into each drying room shall be controlled by a valve located outside the building.
Water Tanks. There shall be an open tank not less than four feet long, two feet wide, and three feet deep near the entrance to every dry cleaning room which shall be so arranged and equipped that it may be kept filled with water to within four inches of its top at all times.
(Prior code § 129.1-86)